HardLabs

Beech215PropController

billmallard·Beech215PropController·hardware_rev3_2/hardware/350A_governor.kicad_pcb

Beech215PropController PCB layout, top view — open source AVR/Arduino board by billmallard

About the Beech215PropController PCB

Beech215PropController is an open source AVR/Arduino PCB design by billmallard, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 80 mm, with 27 components from 18 distinct parts.

Its main chip is the Arduino_Nano_v3.x, from the AVR/Arduino family. Other key parts include the 6N137. By type, the board carries 8 resistors, 5 capacitors, 4 transistors, 4 diodes, 2 connectors and 1 IC.

It belongs with the displays & leds designs in this gallery.

From the project

Digital replacement for the Airborne 350A Prop Controller

The original Airborne Electronics 350A (covered under STC SA2700WE) uses a bang-bang control architecture — the prop motor runs at full voltage until the RPM crosses the target, then reverses. This causes constant RPM hunting, which is made worse by:

- Freshly overhauled prop motors with more torque than the 50-year-old electronics expected - Aging capacitors and resistors in the original controller that shrink the deadband - The original panel rheostat giving no indication of what RPM is actually set - Rough magneto signal from high-time mags degrading the RPM sensing

Main components on the Beech215PropController

6N137Arduino_Nano_v3.x

Beech215PropController bill of materials (BOM)

27 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
6N137
U1
1
Arduino_Nano_v3.x
A1
2
2N2907A
Q1, Q2
2
2N2222A
Q3, Q4
1
CANNON_7PIN
J1
1
PANEL_10PIN
J2
1
1A PTC
F1
1
LM2596-5V
PS1
1
Red LED
D1
1
Green LED
D2
2
1N4001
D3, D4
3
100nF
C1, C4, C5
1
100uF/25V
C2
1
47uF/10V
C3
3
10k
R1, R7, R8
1
4k7
R2
2
330R
R3, R4
2
1k
R5, R6

Beech215PropController design files

The KiCad project lives in the billmallard/Beech215PropController repository on GitHub; these links point at the commit this page was built from.

Beech215PropController: common questions

What microcontroller does the Beech215PropController use?

The Beech215PropController is built around the Arduino_Nano_v3.x, from the AVR/Arduino family.

How big is the Beech215PropController PCB?

The Beech215PropController measures 100 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Beech215PropController?

27 components, from 18 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Beech215PropController design files?

From the billmallard/Beech215PropController repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Beech215PropController design in my own project?

Yes, under the terms of its MIT license, which billmallard chose for the repository.

Can I test firmware for the Beech215PropController without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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